Sanyo CH0971 Technical & Service Manual page 51

(5) Recharging
Be sure to charge the specified amount of
refrigerant in liquid state using the service port
of the wide tube service valve. The proper
amount is listed on the unit's nameplate.
When the entire amount cannot be charged all at
once, charge gradually while operating the unit in
Cooling Operation.
CAUTION
When charging with a refrigerant cylinder, use an
electronic scale for charging refrigerant. In this
case, if the volume of refrigerant in the cylinder
becomes less than 20% of the fully-charged
amount, the composition of the refrigerant starts
to change. Thus, do not use the refrigerant if
the amount in the charging cylinder is less
than 20%.
Also, charge the minimum necessary amount to
the charging cylinder before using it to charge
the air conditioning unit.
Example:
In case of charging refrigerant to a unit requiring
1.68 lb. (0.76 Kg) using a capacity of a 22 lb. (10
Kg) cylinder, the minimum necessary amount for
the cylinder is:
1.68 + 22
(0.76 + 10
For the remaining refrigerant, refer to the
instructions of the refrigerant manufacturer.
If using a charging cylinder, transfer the specified
amount of liquid refrigerant from the refrigerant
cylinder to the charging cylinder.
Prepare an evacuated charging cylinder
beforehand.
CAUTION
Do not use the refrigerant if the amount in the
charging cylinder is less than 20%.
Never charge a large amount
of liquid refrigerant at once to
the unit. This may cause
damage to the compressor.
0.20 = 6.08 lb.
0.20 = 2.76 Kg)
To prevent the composition
of R410A from changing,
never bleed the refrigerant
gas into the atmosphere
while transferring the
refrigerant. (Fig. 3)
Configuration and characteristics of cylinders
Single valve
Charge liquid refrigerant with
cylinder in up-side-down position.
Single valve (with siphon tube)
Charge with cylinder in normal position.
Charging
cylinder
Open
51
Valve
Liquid
Fig. 1
Valve
Liquid
Fig. 2
NO!
Liquid
Refrigerant
cylinder
Fig. 3